diff options
| author | Gwendal Grignou <gwendal@chromium.org> | 2016-03-08 09:13:52 -0800 |
|---|---|---|
| committer | Olof Johansson <olof@lixom.net> | 2016-05-11 11:55:47 -0700 |
| commit | 5d749d0bbe811c10d9048cde6dfebc761713abfd (patch) | |
| tree | 7f8497b6fa3125c0f7256dab097a73fbdc34bc58 /drivers/platform/chrome/cros_ec_proto.c | |
| parent | 492ef7829d2d09428803bffb187d5781bbc12ca5 (diff) | |
platform/chrome: cros_ec_dev - Fix security issue
Prevent memory scribble by checking that ioctl buffer size parameters
are sane.
Without this check, on 32 bits system, if .insize = 0xffffffff - 20 and
.outsize the amount to scribble, we would overflow, allocate a small
amounts and be able to write outside of the malloc'ed area.
Adding a hard limit allows argument checking of the ioctl. With the
current EC, it is expected .insize and .outsize to be at around 512 bytes
or less.
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'drivers/platform/chrome/cros_ec_proto.c')
| -rw-r--r-- | drivers/platform/chrome/cros_ec_proto.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c index 990308ca384f..b6e161f71b26 100644 --- a/drivers/platform/chrome/cros_ec_proto.c +++ b/drivers/platform/chrome/cros_ec_proto.c @@ -298,8 +298,8 @@ int cros_ec_query_all(struct cros_ec_device *ec_dev) ec_dev->max_response = EC_PROTO2_MAX_PARAM_SIZE; ec_dev->max_passthru = 0; ec_dev->pkt_xfer = NULL; - ec_dev->din_size = EC_MSG_BYTES; - ec_dev->dout_size = EC_MSG_BYTES; + ec_dev->din_size = EC_PROTO2_MSG_BYTES; + ec_dev->dout_size = EC_PROTO2_MSG_BYTES; } else { /* * It's possible for a test to occur too early when |